Speaker
Mr
Vincent Cheung
(University of California, Davis)
Description
Even more than 40 years after the discovery of $J/\psi$, the production
mechanism of quarkonia is still not well understood. Non-Relativistic Quantum
Chromodynamics (NRQCD), perhaps the best known approach for studying quarkonia
production can reproduce the $J/\psi$ $p_T$ distribution. However, the long
distance matrix elements (LDMEs) fitted from the $p_T$ distributions fail to
correctly describe the polarization. In this talk, I will outline the recent
challenges to NRQCD and present the first leading order prediction of the
polarization using the Color Evaporation Model, which integrates over all color
states.
Primary authors
Dr
Ramona Vogt
(LLNL/UC Davis)
Mr
Vincent Cheung
(University of California, Davis)
